The new roles will put Gottlieb, a longtime Keystone executive, in charge of development, management, and leasing the firm’s 10 million-square-foot portfolio. He will report to former president and current chief executive Bill Glazer.

In his twelve years at Keystone, Gottlieb has previously served as the firm’s senior vice president and operating partner. According to the company, Gottlieb’s promotion comes as it “seeks to expand the scope and scale of its portfolio.”

Read more about Gottlieb’s new appointments at Philly.com by clicking here.